StyledEdit: Fix PVS 1167

Use new(std::nothrow) so that NULL check for allocated memory makes sense.

Change-Id: I6c0e66c63adda430686727a4085132c4e40c7530
Reviewed-on: https://review.haiku-os.org/692
Reviewed-by: Adrien Destugues <[email protected]>

src/apps/stylededit/StyledEditWindow.cpp

@@ -881,7 +881,7 @@ StyledEditWindow::OpenFile(entry_ref* ref)
 		return;
 	}
 
-	fSaveMessage = new BMessage(B_SAVE_REQUESTED);
+	fSaveMessage = new(std::nothrow) BMessage(B_SAVE_REQUESTED);
 	if (fSaveMessage) {
 		BEntry entry(ref, true);
 		BEntry parent;